Cutter head for woodworking machines



March 27, 1928. 1,663,894

L. B. WHIPPLE CUTTER HEAD FOR WOODWORKING MACHINES Filed July 11, 1923 Fly. 1.

Fig. 3.

Fig.5.

INVENTOR Le/uno/B. id hlj ple ATTORNEY Patented Mar. 27, 1928.

UNITED STATES LELAND B. WHIPPLE, OF ROCHESTER, NEW YORK.

CUTTER HEAD ron woonwonxme 'MAcHinEs. I

Application filed July 11,

My invention is a cutter head having improved means for holding the cutting knives therein, and in its preferred form it comprises a rotatable cylinder head containing knife slots or sockets and recesses communicating therewith but separated therefrom by bearings forming fulcrums for rocking toolclamping blocks, such blocks being rocked on their fulcrums to apply pressure against the knives by wedges having conical bear-v ing surfaces engaging the blocks above their fulcrums and threaded shanks adjustably screwed into the cylinder head. Preferably the tool-clamping blocks have their faces adjacent the knife blades so shaped as to form projections engaging the blades near the periphery of the cylinder head, and the knife, sockets are preferably deeper than the adjacent recesses so as to provide seats for the butts of the knives.

By my improvements, the knives are firmly clamped to the cutter head adjacent to the periphery thereof where they are subjected to the greatest strains. Knives may be used having wide blades or webs and such knives may be repeatedly reground and used so long as there is sutficient blade remaining for the engagement of the projecting shoulder of the block; the fulcrum hearing between the block-recess and knife-slot preventing the bottom of the block slipping into the knife-socket or tilting away from the blade.

In the accompanying drawings, Fig. 1 is an elevation of a cutter head having my improvements applied thereto: Fig. 2 is a transverse sectional view of the cutter head chambered in accordance with my improvements but omitting the knife and its clampingmeans; Fig. 3 is an enlarged fragmentary view showing a section of cutter head with a knife and clamping means in place; Fig. 4 is a perspective view of the clamping block; and Fig. 5 is a fragmentary view of a section of the block showing an 1ndentation or seat for the wedging member.

As illustrated in the drawings, the cylindrical head 1 has formed therein the knifeslots 2 extending in the general direction of the axis of the cylinder and communicating with recesses 3 having inclined bottoms 3. Ridges 4 project from the bottoms 3 and form bearings between the slots and recesses.

A knife blade 5 is seated in each slot, the latter being preferably of greater depth 1923. Serial no. 650,822.'

than. the adjacent recess 3; and each knife having a ground edge projecting beyond the periphery of the cylinder 1. A I

A block 6 is disposed in each recess 3 and has converging bottom sides resting in the trough formed by the inclined bottom 3 and the ridge 4, the latter forming a fulcrum on, which the block rocks. The face of the block adjacent to the knife blade is cut away so as to form a projecting shoulder 6 which engages the knife blade adjacent to the periphery of the" cylindrical head. The sides of the blocks opposite the blades contain a series of indentations 6" forming curved inclined seats for wedging members each comprising a threaded shank 7 a conical. collar 7 carried thereby, a cylindrical portion 7 making sliding contact with the wall of the socket 8, and a head 7 containing a slot for the engagement of a tool.

The cutter is assembled as illustrated in Fig. 3 with a knife 5 in a socket 2, and a block 6 inserted in a recess 3 rocking upon the rib 4 as a fulcrum upon the engagement with the seats 6 of the conical wedging collars 7 The bearings 7 are held in alignment by the engagement of the shank 7 and cylindrical portion 7 with the walls of the socket 8. The tilting of the block forces the shoulder 6 into close engagement with the knife blade near the periphery of the cylinder and presses such blade firmly againstthe wall of the socket 2, The knife can be readily removed'for grinding or adjustment by loosening the wedging members 7 to permit the block 6 to rock away from the knife blade. Reground blades can be again used so long as there is enough of the web of the knife remaining to afford a purchase for the shoulder 6. 'Preferably the tops of the blocks andthe adjacent section of the cylindrical head are cut away to form curved chip pockets 9.

Having described my invention, I claim:

1. A cutter head containing a tool socket, a tool in said socket, a fulcrumed block having a tapering bottom forming an edge on which the block rocks without lifting, said block clampingsaid tool in said socket, and means for rocking said block on its fulcrum.

2. A cutter head containing a tool socket, a tool in said socket, a fulcrumed tool holder having a wedge shaped bottom, forming an edge on which the block rocks without lifting, and a tapering member engaging said holder above its fulcrum to rock it towards said tool.

3. A cutter head containing a knife socket, a recess communicating with said socket and having converging inclined bottom Walls, a bearing forming a fulcrum between said socket and recess, a knife in said socket, a tool holder in said recess and fulerumed on said bearing, and means for rocking said holder on its-fulcrum toward said knife.

4:. A cutter head containing a knife socket, a recess communicating with said socket, a

-bearing between said "recess and socket, a

knife in said socket, a block fulcrumed on said bearing and having a'projecting shoulder engaging said knife, and a conical memher having an inclined surface engaging said block above its fulcrum and a threaded portion adjustable in said head.

5. A cylindrical head containing a recess, a tool holder fulcrumed in said recess and having a tool engaging member adjacent to the periphery of said cylinder, a tool socket in said head, a tool disposed in said socket,

recess .and having a recessed face adjacent to the Web of said knife and a shoulder engaging 'said knife, and a wedge comprising a conical surface engaging said holderand pressing said shoulder against said knife.

7. A cutter head containing a tool socket,

a tool insaid socket, a fulerumed tool holder,

and a revoluble Wedging member engaging and rocking said holder on its fulcrum, said member having axially spaced'bearings engaging said head onopposite sides-of the point of engagement of said holder and member.

In testimony whereof I have hereunto set my name this 2nd day of July, 1923.

' LELAND B. XVHIPPLE. 

